More guides for v.2 will be here in future… If you wrote a guide/tutorial on your site or you like to write one here, please let me know.
For now the guide v.1 is here.

Screencast:
How to create and send a Newsletter:

How to manage a multilingual newsletter

For now you have 3 ways, maybe 4…

1. Using EasyMail without other multilingual plugin

In this scenario you don’t have a multilingual blog. But using EasyMail you can collect subscribers detecting the browser language according with available languages that you setup. Then you can send newsletters to subscribers in regard to language.How-to:

When you save and send a newsletter, in Recipients metabox you can filter subscribers according to languages.

2. Using EasyMail & WPML

You have a multilingual blog and you are using WPML (WordPress Multilingual Plugin) to manage it.
You can collect subscribers detecting the browser language according with available languages that you setup in WPML. Then you can send newsletters to subscribers in regard to language.How-to:

After activating WPML in your blog and choosing available languages, EasyMail should automatically generate a Newsletter subscription page for each language: go to Pages → All Pages to check it (maybe you like to edit the title of translated pages).

Then, you have to create a newsletter for each language and send newsletters to subscribers in regard to language.

3. Using EasyMail & qTranslate-x

You have a multilingual blog and you are using qTranslate-x.
You can collect subscribers detecting the browser language according with available languages that you setup in qTranslate-x. Then you can send newsletters to subscribers in regard to language.How-to:

After activating qTranslate-x in your blog and choosing available languages, the WP newsletter content editor is replaced with the userfriendly multilingual editor by qTranslate-x: you have to create only one newsletter, enter the content for each language available and each subscriber will receive the newsletter according to her/his language.